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City of Mounds View Page 13 <br />Ardan Avenue Drainage Subdistrict Analysis 000435-07129-0 <br />4.9 LOW POINT ON REDOAK DRIVE,NORTH OF ARDAN AVENUE <br />Existing Flood Protection Characteristics: <br />ƒOverland area to street low point (Node 31) = 3.5 acres <br />ƒSurveyed critical flow path elevation (circled in blue above) = 908.87 feet <br />ƒSurveyed lowest opening elevation = 909.28 feet (8267 Redoak Drive Garage Floor) <br />ƒFlood protection between critical flow path and lowest opening elevations = 0.41 feet <br />ƒExisting downstream conveyance restriction = 24” storm sewer, downstream of Node 31 <br />Proposed Improvements to Increase Flood Protection: <br />ƒAbandon 18” storm sewer between Nodes 22 and 24, 30A and 31 <br />Tributary area to Node 31 is reduced from 53.0 to 22.4 acres <br />2-year runoff rate from Node 31 is reduced from 33 to 16 cfs